#include<stdio.h>
//猜凶手
//多挑1
int main()
{
	for (char killer = 'A'; killer < 'D'; killer++)
	{
		if ((killer != 'A') + (killer == 'C') + (killer == 'D') + (killer != 'D') == 3)
			printf("killer 是 %c", killer);
	}
	
	return 0;

}